Improvement in packing-rings for piston-heads



J. HARPER. Paoki-n'g fiing for Piston-Heads.

Patented May 6, 1879.

fI NVENTOR A4TORNEYS WITNESSES I I I I UNITED "STATES PATENT ()FFIGE.

JOHN HARPER, OF DUNOANNON, PENNSYLVANIA.

IMPROVEMENT lN PACKING-RINGS FOR PISTON-HEADS.

Specification forming part of Letters Patent No. 2 I 5,121, dated May 6,1879; application filed March 25, 1879.

To all whom it may concern:

Be it known that I, JOHN HARPER, of Duncannon, in the county of Perry,and in the State of Pennsylvania, have invented certain new andusefulImprovements inPackin g-Rin gs for Piston-Heads; and do hereby declarethat the following is a full, clear, and exact description thereof,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, making a part of this specification.

The nature of my invention consists in the construction of packin g-rings for piston-heads, whereby a side pressure is obtained as well as anoutward pressure, for the purpose of keepin g the joints tight betweenthe packing-rings and the piston and the follower, as will behereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, in whichFigure 1 is a front View of a piston-head embodying my invention. Fig. 2is a central section of the same.

A represents the piston, and B the follower, connected together in anyknown and usual manner. Between these are the packing-rim gs (J D, whichare forced outward by means of springs.

As I lay no claim to the arrangement of the springs, Ihave simply showna series of springs, E; but I do not confine myself thereto, as one ormore springs may be used in any of the known and usual ways.

The packing-rings C D fit one within the other, the inner ring, 0, beingtapering on the outside, and the outer ring, D, correspondingly taperingon the inside, and each ring formed with a flange, a, to overlap theedge of the other ring, as shown.

It is of great importance in a piston-head that the packing-rings shouldbe forced outward to fit the cylinder; and it is equally if not moreimportant that the packing-rings should have acertain amount of sidepressure, so as to keep the joints tight between them and the piston andfollower.

This is the object of my invention, and the same is fully accomplishedby the tapering form of the adjacent faces of the packin g-rin gs, forthe interior spring-pressure not only expands the rings against thecylinder, but also has a tendency to force them apart sidewise, and keepthem tight against the piston and follower.

Haying thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a piston-packing operated by means of interior spring-pressure,the packin g-rin gs G D, fitting one Within the other, and theiradjacent faces made tapering or inclined, and each ring provided with anoverlapping flange,

substantially as and for the purposes herein set forth.

2. The combination of the piston A, follower B, and the packing-rings OD, constructed substantially as described, and provided with overlappingflanges a a, whereby any pressure from the inside will expand the rings,and also force them sidewise, for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this18th day of March, 1879.

JOHN HARPER.

Witnesses:

JOSEPH SMITH, CHARLES J oNEs HOLLAND.

